Power Electronics
 Multiple-Output Regulator Powers Vehicle LCD Displays

Multiple-Output Regulator Powers Vehicle LCD Displays

Allegro MicroSystems, LLC has introduced a AEC-Q100 qualified, multiple-output regulator for powering automotive LCD displays. Allegro's A8603 operates with fixed switching frequency that can be either programmed or synchronized with an external clock signal between 350 kHz and 2.25 MHz. This will minimize interference with AM and FM radio bands. An I²C-compliant serial interface allows a system microcontroller to configure the A8603 by writing into its internal registers. A system controller can also access A8603's status registers in case of fault conditions.

The A8603 incorporates a boost stage followed by two linear regulators and two charge-pump regulators. Each output voltage can be programmed independently through the I²C serial interface. During power-up and shutdown, the outputs are turned on and off in preprogrammed sequences with adjustable delay. This allows the user to meet the sequencing requirements for specific LCD panels. Short circuit protection is provided for all outputs. The internal boost switch is protected against overcurrent and overvoltage.

The A8603 is available in a 24-pin, 4 x 4 mm QFN package. It has an exposed thermal pad to allow operation at high ambient temperatures and is lead (Pb) free with 100% matte-tin leadframe plating. The A8603KESTR-R is priced at $1.65 in quantities of 1,000.

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